Blow-off cock.



' R. w. ERSKINE.

' BLOW-OPF COOK.

APPLIUATIQK FILED IAB. 25, 1910.

PatenteaAugsJsloq Y 1 nu leali! rrrll'l au.. IAIIMUDI. s c.

` RALH W. ERSKINE, GF PITTSBURG, KANSAS.

To all whom 'it may concern:

Be it known that I, RALPH lV.' Ensluivn,

citizen of the United States, residing at Pittsburg, in the county ofCrawford and State of Kansas, have invented certain new and usefulImprovements in Blow-(3ftn Cocks, of which the following is aspecification.

My invention relates to valves and particularly to blow-oft' cocks suchas are used on steam boilers. l

The object ot the invention is to provide a blow-ott' cock, the inletopening ot' which ymay be closed, Vwhile the main valve is beingrepaired or replaced.

In blow-olf cocks as ordmardy made, when it is desired to replace orrepalr the main valve it is necessary to allow the steam and water to bedrawn ott from the boiler, as

i this condition that l havedevised my irlotherwise the steam or waterwould be blown out of theblow-ol cock, wlnle ythe valve wasout of itsplace. It 1s to remedy reference is to be had to the followingdescription `and y accompanying Y drawing, in Whichzv f Figure l is alongitudinal section of the valve-casing and valve, the operating shaftand the auxiliary valve being in elevation. Fig. 2 is aperspectivedetailview of the eccentric, and Fig. 3 is a perspective detail view of theauxiliary valve operating rod and ring. f

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing by the samereference characters. t

Referring tol these .'igures designates the body of the shell orblow-oit cock7 and 3 the tubular extension leading therefrom, and whichis screw-threaded at its extremity as at 4 for engagement withtheboiler. The end: of this extremity is formed with a valveseat 5 of anysuitable character.

The shell or body 2 at one end is screwthreaded for engagement with ahub 6 through which the main valve stem asses and screw-threadedlyengaged with this hub p ras PATE-NT OFFICE.

i i BLOW-OFF COCK.

l 'Specication of Letters Patent; Patented Aug, 23, 1910. Applicationfiled March 25, 191. Serial No. 551,572. v i

is the packing nut 7. The other end of the shell or casing 2 isinteriorly screw-threaded t'or engagement with an annular member 8,screw-threaded on its interior as at 9 for engagement with a pipeconnection. This annular member is preferably hexagonal upon yits outerface to provide means whereby a wrench may be applied thereto. The innerend of the annular member 8 is formed with a valve-scat 1() againstwhich the valve 15 engages, this seat being preferably beveled.

Passing through the hub G andthe gland is the valve-rod 11 formed at itslower end This rod 11 at its lower end is detachably engaged with avalve-stem 13 having an enlarged lower portion 14 which lfits in. ascrew-threaded recess in the upper face of the valve body 15. A nut 16engages with-the screw-threaded inner face ofthe valve body 15 and actsto hold the valve body in engagement with the stem 1?. The outer face ofthe valve body 15 is provided with a stud 1,7 whereby the valve body mayhe rotated to easily diseugage it l lt will be seen that the valve bodyand the nut 1G are free to rotate from the nut 1G.

upon the stein 1.3, ror in other words are held in swiveled engagementwith the stein. The inner end of the stem V13 is screwthreaded forengagement with a screw threaded recess 18 formed in the lower end ofthe main valve-stem 11. Y

As a means of closing the inlet through the lateral extension 3 lprovide the valve body 19 screw threaded upon a spindle 20, or stem,passing through a guide 21 intersecting the extension 3 which rod orspindle 20 at its end is provided with a ring 22 with which theeccentric 12 loosely engages. A lock-nut 23 holds the valve 19 in anyadjustable position on the rod 20. y

' The purpose of my invention is as follows z--Under ordinarycircumstances the eccentric 12 projects in the direction of theextension 3 and hence the rod 20 is held projected and the valve 19 isheld clear ofA the valve-seat 5. The eccentric 12 has a much greaterwidth than the width of the ring 22 and hence the eccentric may be movedthrough the ring 22.' The eccentric is of course o erated by thevalve-stem 11. By raising or owering the valve-stern 11 the f valve islowered or raised to or from its f seat 10. Any suitable means may beprovided for reciprocating the valve-stem 11. I have not illustrated anysuch means as it necessary to iotate the valve stem 11, thereby drawinginwardly the rod 20 and throwing the va ve 19 into contact with the seat5. In this position, the valve 19 willbe held to its seat by thepressure behind it. `By now removing the annular member 8 the valve maybe easily detached from the stein" 11 and removed for regiinding orrepairing, Vor the member 8 may be renie-ved and the seat thereinreground. During all this th pressure holds the valve 19 in placeagainst the seat 5. After the valve is replaced in position, and theparts are in their normal condition, the stein 11 is rotated until thevalve 19 is forced voutward and" v away from the seat 5.

ya main valve operable in one It will be seen that my invention is verysimple, and I have found it iii practice to be entirelyl effective,obviating the Ausual inconveniences incident to the removal of theblow-off cock. valve yand eliminating the necessity of drawing thefires, or blowing off the steam and water prior to removing the valve.'c f f Having thus described the invention what is claimed as newisz- 1.A blow-ott' cock having therein a main valve operatively movable iii onedirection to control the passage through the blow-olf cock, and having aportion movablel in a plane at iight angles to the direction firstnamed, an auxiliary valve operable in a. direction at right angles tothe first named movement of the main valve, and a connection betweensaid main valve and the auxiliary valve whereby the auxiliary' valve maybe moved by the second named movement of the main valve.

2. kIn a blow-oli' cock, a casing having a main valve seat and anauxiliar valve seat, direction, an auxiliary valve operable in a.direction at an angle to the direction of movement of the main valve,and a valve-stem operatively connected to the main and auxiliary valves,

movable in one direction to operate the main 4 valve, and also operableto close or openthe auxiliary valve. f f

3. In a blow-off cock, a casing having an inlet opening and an outletopening, a valvestein passing through ing a valve at its end engagingwith the outthe casing and havv let opening, said valve-stein beingrotatable,

yan auxiliary valve adapted to close the inlet opening, and a connectionfrom said auxiliary vaive to the'valve-stem whereby the of the mainvalve-stem.

'4. In a blow-oli' cock, a casing having an Vinletopening and an outletopening and havthe spindle, said spindle'and valve being rotatable, anauxiliary valve closing the inlet opening to said casing, a rodconnecting said auxiliary valve to the valve-stem, and means on thevalve-stem for reciprocating said'rod upon a rotation of the valve-stem.

5. In a blow-oft' cock, a casing having a, lateral extension formed witha valve-seat vauxiliary valve may be' closed by a rotation at its end,said casing being provided with Y a valve-seat at one end, alongitudinally shiftable, rotatable stein passing into the casing, avalve on the end thereof eiigageable with the valve-seat on the casing,an eccentric carried by said stem, an auxiliary valve adapted to closeagainst the seat on the extension, a rod connected to the auxiliaryvalve, and a ring on the end of said rod surrounding tlie eccentric.

G. In a blow-oli' cock, ay casing having a screw-threaded opening at oneend and provided with a lateral tubular extension having a valve seatand adapted to be screwed into a boiler,` an annular memberscreivthreaded into saidl open end of the casing and forming avalve-seat, a longitudinally shiftable, rotatable main valve-stempassing into thecasing, an eccentric formed on said stem, a main valve,a connecting stem detachably connected to the main valve stem anddetachably connected to the main valve, an auxiliary valve adapte-d tofit against the valve-seat on the extension, a rod extending from saidauxiliary valve through the ex tension, and a ring on the end of saidrod Surrounding the eccentric on the said valve stem, said eccentricbeing fitted to the said ring so as to permit the eccentric to shiftlongitudinally therethrough.

'In testimony whereof@ aflix my signature in presence of two witnesses.

RALPH W. ERSKINE. [1.. SJ

Witnesses:

Amnirr J. PORTER, WILLIAM HUDSON.

